What is it when you run a chemical reaction under ordinary circumstances, what's constant?
如果你在通常的环境下进行化学实验，那么这些条件是什么？什么保持常数？
The constant chemical trickle is an old worry for environmentalists.
这一化学药剂的涓涓之流，早就令环保人士忧虑了。
The constant chemical trickle is an old worry for environmentalists.
这一化学药剂的涓涓之流，早就令环保人士忧虑了。
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